A 2000W electric heater is used to heat a metal... - JAMB Physics 2003 Question
A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is
A
6.0 x 104JoC-1
B
4.0 x 104JoC-1
C
1.2 x 104JoC-1
D
8.0 x 104JoC-1
correct option: b
2000W heater → 2000J/S
=> Heat supplied by the heater within 10 min
(600 seconds) = 2000 x 600
= 1200000J
∴ Heat capacity MC = 1200000/30
= 4000J/C
Heat capacity = 4.0 x 104J/C
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